Return all the strained fat to the pan. Add onions and sauté over medium heat for about 3 minutes or until lightly browned. Add garlic and cook until aromatic, about 1 minute. Stir in flour and cook, stirring often, 5-7 minutes or until a light, golden, sandy color. Meanwhile, heat up milk and coffee in a medium
saucepan over medium heat until warm to the touch.